存在金属障碍物无线电能传输特性分析  

Analysis of wireless power transmission characteristics with metal obstacles

作　　者：刘伟[1] 王赟[1] Liu Wei;Wang Yun(Huali College Guangdong University of Technology,Guangzhou 511325,China)

机构地区：[1]广东工业大学华立学院

出　　处：《电子测量技术》2019年第10期38-42,共5页Electronic Measurement Technology

基　　金：2018年校级科研项目(HLKY-2018-ZK-04);2017年校级科研项目(HLKY-2017-ZK-01)资助

摘　　要：无线电能传输技术是特种机器人实现轻量化可持续工作的关键技术。通过磁耦合谐振式无线充电时,须考虑金属障碍物对无线电能传输系统影响。将金属涡流效应等效互感耦合电路,通过耦合电路理论对传输系统建模。推导出电压增益系数传输方程,以及金属障碍物对传输系统的能量损耗表达式。随着耦合系数的变化传输系统依然存在频率分裂,临界耦合、过耦合和欠耦合情况。在给定传输系统参数下,临界耦合系数Kc=1.54×10-4,当存在存在金属障碍物时,K′c=1.09×10-2。金属障碍物导致无线传输系统电压增益减少,谐振频率偏移,耦合系数增大,耦合性能下降。通过仿真得到该系统存在金属障碍情况下输出电压的变化。Wireless power transmission technology is the key technology that enables special robots to achieve lightweight sustainable work.The magnetic coupling resonant wireless charging,must consider the impact of metal obstacles on the transmission system.The metal eddy current effect is equivalent to mutual inductance coupling circuit, and the transmission system is modeled by coupling circuit theory.The transmission equation of voltage gain coefficient and the expression of energy loss of metal obstacles to transmission system are derived.With the change of coupling coefficient,the transmission system still has frequency splitting,critical coupling,over-coupling and under-coupling. Given the parameters of the transmission system,the critical coupling coefficient Kc =1.54×10-4.When there are metal obstacles,K′c=1.09×10-2.which lead to the reduction of voltage gain,the shift of resonance frequency,the increase of coupling coefficient and the decrease of coupling performance in wireless transmission system.The change of output voltage in the presence of metal barrier is obtained by simulation.

关 键 词：无线电能传输 磁耦合 金属障碍物 电压增益系数 仿真 

分 类 号：TM133[电气工程—电工理论与新技术]